Abstract
Phylogenetic analysis of ca. 4500 base pairs of mitochondrial DNA sequence data reveals further genetic diversity in mouse lemurs (Microcebus) on the eastern and western coasts of Madagascar. Molecular data and phylogenetic analyses revise the previously monotypic species of eastern Madagascar, Microcebus rufus, with the description of 3 new species. Three additional Microcebus species are proposed in eastern Madagascar, along with another Microcebus species in western Madagascar. Correlating the molecular data with previously generated sequence data, we present a tentative pattern of distribution along the east coast. We show that the general distribution of Microcebus is based on a traditional eastern/western division. The preliminary model appears strongly influenced by both rivers and altitudinal differences acting independently as barriers.
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